Calcification indicator

Details Calcification indicator Calcification indicator

1988-07-07

1989-05-09

Jenkins, Robert W.

Foods and beverages: apparatus

Beverage

Infusors

99285, 99295, 219308, 219333, A47J 3100

Patent

active

048278378

ABSTRACT:
For a coffee brewing machine, an indicating system which operates to notify the user when it is time to clean the water supply conduit of accumulated mineral deposits. When a self contained removable reservoir is inserted into its operative position connecting to the water supply conduit, it closes the contacts of a temperature sensitive switch. During normal operation, the switch opens when water is depleted from the reservoir and the brewing cycle is completed. However, if the switch opens while water remains in the supply conduit upstream of the heater mechanism, this is a sure indication that there is a substantial accumulation of mineral deposits in the supply conduit. Thus, a sensing mechanism is employed to detect the presence of water in the supply conduit after the temperature sensitive switch opens, and a lamp is energized to indicate the condition. In one embodiment, the sensing operation is performed by an electromechanical device, and in another embodiment by logic circuitry.

REFERENCES:
patent: 4139761 (1979-02-01), Obrowski
patent: 4141286 (1979-02-01), Smit
patent: 4214148 (1980-07-01), Fleishhauer
patent: 4292499 (1981-09-01), Kleinschmidt et al.
patent: 4608916 (1986-09-01), Becker et al.
patent: 4713525 (1987-12-01), Eastep
Magazine Article, Source unknown, dated 12/7/87 entitled "Bosch Takes Automotive Acumen into U.S. Kitchen Product Arena"; of interest: Smarty indicator light.

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